Improvement in rotary engines



D. n. HARDY.

. l Ro'rARYfENGINE. N.1s4,za4. Patented Nov.14,.1876

I FFE.

DEXTER D. `OF DELAVAN, ILL., ASSIGNOR `OF ONE-HALF HIS RIGHT TO GEORGEC. WHITMORE AND WILLIAM A. JACOBUS, OF SAME PLACE.

IMPROVEMENT IN ROTARY ENGINES.

Specification forming part of Letters Patent N o. 184,284, datedNovember 14, 1876; application led September 18, 1876.

To all whom it may concern v Be it known that I, DEXTER D. HARDY, ofDelavan, in the county of Tazewell, and in the State of Illinois, haveinvented an Improve-` head B removed; and Fig. 2, across-section ,alongdotted line a a, a a., Fig. 1. f

This engine is designed for a rotary steammotor, but may also be adaptedfor use as a pump or blowing-machine, Src.

It consists, first, of a stationary cylinder, with the usual heads andports, in which the steam is admitted or discharged.

Second, inclosed between the heads of said cylinder is'an annularinternal-toothed wheel, i. e., without spokes, of the same diameter as,and revolving against, the interior surface of said cylinder, andl alsoon its sides against the cylinder-heads. This wheel is provided with twoor more lugs or steam-abutments, in the shape of one of the teeth muchenlarged, projecting toward the center of the wheel, and whichnecessarily supplant some of the teeth, placed equidistantly on itsinterior. By these lugs the wheel is impelled, by means of steam, ashereafter described.

Third, with the teeth of latter wheel is engaged a wheel or pinion ofequal thickness with that of said annular wheel, but of much lessdiameter, and, like the same, extending from head to head, andprovided'on its periphery with recesses toreceive and let pass each lugofthe larger wheel as it comes round. This pinion or wheel is set 0n anaxle or shaft, which passes through one or both of the cylinder-heads,from whence the power is applied to the operation of machinery.

Fourth, filling the space not swept over by the lugs of the larger wheelnor the teeth of the pinion, and extending from head to head of thecylinder, is a crescent-shaped block, which contines the steam to itspressure on the lugs of 'said annular Wheel after they pass the forms inwhich I construct this engine, y

A is the cylinder; B B, the cylinder-heads, one being nearly entirelyremoved; C, the annular internal-toothed wheel; e e e, steamlugs; AD,the pinion; f, spaces cut out to admit the steam-lugs e of the otherwheel; b, the crescent-shapedblock, between the cylinder-heads and thewheels C D; g g, the steam-ports, each having a depression, g g',opening into it, excavated from the inner surface of the cylinder-head,and extending toward the engaged part of the Wheels, used merely toextend the operation of the steam; E, the shaft.

The operation of this engine is as follows: The cylinder is stationaryor iixed. Steam, entering one of the ports g, near Where the'wheelsbecome disengaged, acts against one of the lugs-eef wheel C, cach ofwhich lugs has a bearing or contact on the outer curve of the *block b,for about half a .revolution of the wheel C. The two Wheels beingengaged by teeth, the pinion D is caused to rot-ate,I the'exhaust steampassing off by the other port when the lug ceases contact with saidblock b. The lug, continuing its course, passes the pinion D by beingadmitted within the recess or recesses f of the latter. Steam ispreventedfrom passing to the other port by reason of the contact of theteeth of pinion D With ,the inner curve of the block b.

The engine is reversible by making either port the supply-passage forsteam, lthe steam,- lugs e always actingv as cut-offs or openers of theports in either case.

What I claim as my invention is- In combination with the cylinder A andheads B, provided with steam-ports g g, an

tary steam-engine I have hereunto set my hand this 8th day of September,A. D. 1876.

DEXTER D. HARDY. Witnesses:

WM. A. RENNEN, I. H. J. WALSINGHAM.

